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17 results for “Optical constants”
EUV optical constants data set
<p>Dataset of optical constants in the extreme ultraviolet (EUV) spectral range, including 13.5nm, obtained from reflectivity measurements.</p>
Optical constants of several multilayer transition metal dichalcogenides measured by spectroscopic ellipsometry in the 300-1700 nm range: high-index, anisotropy, and hyperbolicity
<p># Data and plotting code for "Optical constants of several multilayer transition metal dichalcogenides measured by spectroscopic ellipsometry in the 300-1700 nm range: high-index, anisotropy, and hyperbolicity" by Battulga Munkhbat, Piotr Wróbel, Tomasz J. Antosiewicz, and Timur O. Shegai, ACS Photonics (2022); https://doi.org/10.1021/acsphotonics.2c00433</p> <p><br> ## Contents</p> <p>* <TMD-material>: directories with raw and derived data for all 10 TMDs<br> * f3_dataset_*_nm_ex1_ex2_ey1_ey2_ez1_ez2.txt: obtained permittivities<br> * plot_*_v1.m: Matlab scripts for plotting data</p> <p>## Description of the data</p> <p>The raw and derived data stored in directories <TMD> contain the following files:</p> <p>* <TMD>/<date>-<TMD>.SEsnap: binary data file with collected data, CompleteEASE format<br> * <TMD>/<date>-<TMD>-E*.mat: ascii text file with permittivity data separated into individual components as exported from CompleteEASE software<br> * <TMD>/<date>-<TMD>-full.mat: ascii text file with fitted model parameters as exported from CompleteEASE software<br> * <TMD>/<TMD>-data/*.txt: selected raw data and fits for all considered samples (Mueller Matrix or Delta/Psi/depolarization).</p> <p>The structure of the data file names is as follows:<br> <order-number-in-CompleteEASE>-s<sample-name>-<data-type>.txt for general ellipsometry (delta, psi, depolarization) or<br> <order-number-in-CompleteEASE>-s<sample-name>-o<in-plane-sample-rotation-number>-mm.txt for Mueller Matrix measurements.</p> <p>The following two scripts can be used to plot the raw measured data (solig lines) along with corresponding fits (black dotted lines):</p> <p>* plot_mm_v1.m: Matlab script for plotting Mueller Matrix data for WTe2 and ReS2<br> * plot_psi_delta_depol_v1.m: Matlab script for plotting psi, delta, and depolarization data for other TMDs</p> <p>The diagonal permittivity tensor data are saved in the f3_dataset_*_nm_ex1_ex2_ey1_ey2_ez1_ez2.txt files which can be plotted using the plot_permittivity_v1.m Matlab script. The format of this file is as follows:</p> <p>wavelength in nanometers; real part of epsilon_xx; imaginary part of epsilon_xx; real part of epsilon_yy; imaginary part of epsilon_yy; real part of epsilon_zz; imaginary part of epsilon_zz;</p> <p> </p> <p> </p>
Optical Constants of a single AlN layer on Si
<p>Spectroscopic ellipsometry was used to determine the thickness and dielectric function of a Aluminium Nitride (AlN) layer on a Si wafer. The layer was determined to be 170 nm thick. The layer was provided by AIXTRON and manufactured by means of MOVPE.</p> <p>The data was created using a M2000DI spectroscopic ellipsometer from Woollam Co. Inc. Analysis was done using the CompleteEASE software. The model used is a multi-peak oscillator model for the AlN layer.</p> <p>The data resembles common database values for the material AlN.</p>
Infrared Spectra and Optical Constants of Amorphous Isocyanic Acid, Formaldehyde, and Formic Acid
<p>Infrared spectra and optical constants from Hudson et al., 2024, ApJ 977 (1), 130. DOI: 10.3847/1538-4357/ad8c43</p>
Tholin optical constants and cross-sections from Corrales & Gavilan et al., 2023 (accepted ApJL)
<p>Data release for Corrales, L., Gavilan, L., Teal, D. J., Kempton, E. M.-R., 2023, ApJL, in press</p> <p>Provides the optical constants from tholins grown in the laboratory (Gavilan et al. 2017, 2018) and computed cross-sections (Mie) for a wide range of particle sizes, for wavelengths of 0.13-10 micron. Python libraries and code for reproducing this work are provided. A static, refactored version of Exo_Transmit (Kempton et al. 2017, Teal et al. 2022, Corrales et al. 2023) is also provided for computing exoplanet transmission spectra with the new tholin species. </p> <p>See README file for a full list of contents and instructions for use.</p>
Optical constants of CO and CO2 in the IR ans THz ranges and code to calculate the opacity of icy interstellar grains
<p>Data set of optical constants of CO and CO2 in the IR and THz ranges (0.3–12.0 THz). These data are used to compute the opacity of coated materials in an astrophysical context in our accepted article for publication in A&A, 2022.</p> <p>The following link provides access to the "qabs" open access code and its source to calculate the opacity using the optical constants. The code computes Qabs, Qsca, and Qext from the refractive index or the dielectric constant using Mie's theory:</p> <p>https://bitbucket.org/tgrassi/compute_qabs/src/master/</p> <p>The link redirects you to an open-access environment where to execute the code properly.</p>
The anisotropy in the optical constants of quartz crystals for soft X-rays
<p>The refractive index of a y-cut SiO2 crystal surface is reconstructed from polarization dependent soft X-ray reflectometry measurements in the energy range from 45 eV to 620 eV. In the datasets the 1-delta and beta values for the (100) and (001) direction of the SiO2 crystal for the different energies are provided.</p>
Optimal (v, 4, 1) binary cyclically permutable constant weight codes ((v,4,1) optical orthogonal codes (OOC)) and cyclic S(2, 4, v) designs
<p><strong>Optimal (v, 4, 1) binary cyclically permutable constant weight codes ((v,4,1) optical orthogonal codes (OOC)) and cyclic S(2, 4, v) designs.</strong></p> <p><strong>All (v,4,1) OOC</strong> for 26≤v≤76 and v=85: All_oc_26-85_4_1.zip</p> <p><strong>All cyclic 2-(v,4,1) designs</strong> for v=40, 52, 64, 76, 88: d_4_1.zip.</p> <p><strong>Some (v,4,1) OOC: </strong></p> <p>The codes are constructed by backtrack search considering all possibilities for the first two codewords (n=0 and n=1), but only the first 3 possibilities for the n-th codeword (n > 1) are considered for 77≤v≤98: E3oc_77-98_4_1.zip.</p> <p>The codes are constructed by backtrack search considering all possibilities for the first two codewords (n=0 and n=1), but only the first 2 possibilities for the n-th codeword (n > 1) are considered for 99≤v≤136: E2oc_99-136_4_1.zip</p> <p><strong>Some cyclic 2-(v,4,1) designs. </strong>The designs are constructed by backtrack search considering all possibilities for the first two or three baseblocks, but only the first 2 possibilities for the n-th baseblock (n > 1 for strictly cyclic designs, n>2 for designs with one short orbit) are considered for 100≤v≤160: E2d_4_1.zip</p>
Optical constants, cross-sections, and supporting Python scripts for Fe L shell XAFS compounds in Corrales et al (2024), accepted to AAS Journals
<p>This Zenodo repository contains the data products and calculations of Corrales et al. (2024), https://arxiv.org/abs/2402.06726 (accepted to AAS Journals)</p> <p> </p> <p><strong>A WORD OF CAUTION</strong></p> <p>The cross-sections presented here have not been shifted in absolute energy scale. One of the key results from Corrales et al. (2024) is that the energy scale calibration for these compounds needs to be revisited. Please proceed with caution when using this information.</p> <p> </p> <h2>Optical Constants</h2> <p>kkcalc_products/ - This folder contains optical constants for the various compounds</p> <p>kkcalc_products/*_input.dat files contain the absorption as measured in Lee et al. (2009) https://ui.adsabs.harvard.edu/abs/2009ApJ...702..970L/abstract). These values are supplied as input to kkcalc (https://ui.adsabs.harvard.edu/abs/2014OExpr..2223628W/abstract, available at https://github.com/benajamin/kkcalc), along with the stoichiometric formula and material density for the compound of interest.</p> <p>kkcalc_products/*_refrac.dat files contain the kkcalc output, i.e., the real and imaginary parts of the complex index of refraction (m). The "Delta" column equals Re(1-m) and the "Beta" column equals Im(m).</p> <p> </p> <h2>Python Scripts</h2> <p>extinction_xsects.py - Calculates the extinction cross-section for an MRN distribution of dust</p> <p>These Python files from github.com/eblur/gastronomy are used by extinction_xsects.py in order to properly scale the mass column density to Fe abundance:</p> <ul> <li>abundances.py</li> <li>molecules.py</li> <li>minerals.py</li> </ul> <p> </p> <h2>Extinction Cross-sections</h2> <p>extinction_xsects/ - This folder contains the results of extinction_xsects.py</p> <p>extinction_xsects/*_FeL.pdf - A plot of the high resolution Fe L shell features</p> <p>extinction_xsects/*_broad.pdf - A plot of the broad band (0.3 - 10 keV), lower resolution cross-sections with 50 eV spacing. These cross-sections include extrapolations for the K and L shell features for other elements in the compounds based on Henke tables (see Watts et al. 2014)</p> <p>extinction_xsects/*_final.pdf - A plot of the consolidated (low resolution broad band and high resolution Fe L shell) extinction cross-sections</p> <p>extinction_xsects/*_xsect.fits - The final cross-section information for each compound, stored as fits file table. The table columns are energy, absorption optical depth, scattering optical depth, and extinction optical depth. All optical depths are scaled to have a total dust mass column of 1e-4 g cm^-2.</p>
Infrared Optical Constants of Crystalline Cyanogen at 100 K
<p>The optical constants of crystalline cyanogen (C<sub>2</sub>N<sub>2</sub>) at 100 K in the wavenumber range from 3100 to 550 cm<sup>-1</sup> are given here. These data are discussed in a manuscript submitted to the Planetary Science Journal (Hudson & Gerakines 2023). </p> <p>The same data have been uploaded in two different formats: plain ASCII (C2N2_100K_n_k.txt) and Microsoft Excel (C2N2_100K_n_k.xlsx). </p>
Visible to Mid-Infrared Optical Constants of Orthopyroxenes: data
<p>The data stored here are the input and output data of optical constant modeling of orthopyroxenes.</p>
Mid-infrared optical constants of silicate glasses supporting planetary surface science and spectroscopy studies.
<p>The dataset supports the manuscript on "Wavelength dependent Mid-infrared Optical Constants (5-25 µm) of silicate glasses: A Genetic Algorithm approach" submitted by the authors to Earth and Space Science. </p> <p>data.xlsx - contains the measured micro-FTIR spectra, the modeled reflectance spectra by the GA-LSQ approach, the residual between the measured and modeled spectra, the wavelength dependent optical constants n and k for all the glasses studied. </p> <p>This work was supported by NASA PDART grant 80NSSC21K0877 to E. C. Sklute and the RISE2 SSERVI cooperative agreement 80NSSC19M0215.</p> <p> </p>
OPTICAL CONSTANTS AND LAB SPECTRA OF WATER ICE V1.1
Transmission spectra of amorphous and crystalline H2O-ice at temperatures from 20-150 K for a wavelength range from 1.11 to 2.63 microns. These spectra have not been continuum-corrected or had the infrared interference fringes removed. Optical constants (n and k values) were derived from these laboratory spectra and are included in the data set.
OPTICAL CONSTANTS AND LAB SPECTRA OF WATER ICE
Transmission spectra of amorphous and crystalline H2O-ice at temperatures from 20-150 K for a wavelength range from 1.11 to 2.63 microns. These spectra have not been continuum-corrected or had the infrared interference fringes removed. Optical constants (n and k values) were derived from these laboratory spectra and are included in the data set.
OPTICAL CONSTANTS AND LAB SPECTRA OF WATER ICE V1.0
Transmission spectra of amorphous and crystalline H2O-ice at temperatures from 20-150 K for a wavelength range from 1.11 to 2.63 microns. These spectra have not been continuum-corrected or had the infrared interference fringes removed. Optical constants (n and k values) were derived from these laboratory spectra and are included in the data set.
OPTICAL CONSTANTS AND LAB SPECTRA OF WATER ICE V1.0
Transmission spectra of amorphous and crystalline H2O-ice at temperatures from 20-150 K for a wavelength range from 1.11 to 2.63 microns. These spectra have not been continuum-corrected or had the infrared interference fringes removed. Optical constants (n and k values) were derived from these laboratory spectra and are included in the data set.
OPTICAL CONSTANTS AND LAB SPECTRA OF WATER ICE V1.1
Transmission spectra of amorphous and crystalline H2O-ice at temperatures from 20-150 K for a wavelength range from 1.11 to 2.63 microns. These spectra have not been continuum-corrected or had the infrared interference fringes removed. Optical constants (n and k values) were derived from these laboratory spectra and are included in the data set.
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